WorksheetFunction.Atanh (Excel)

Returns the inverse hyperbolic tangent of a number. Number must be between -1 and 1 (excluding -1 and 1).

The inverse hyperbolic tangent is the value whose hyperbolic tangent is Arg1, so Atanh(Tanh(number)) equals Arg1.

Atanh (Arg1)

Arg1: Any real number between 1 and -1.

Dim dblArg1 As Double: dblArg1 = 
Dim dblAtanh As Double
dblAtanh = WorksheetFunction.Atanh(Arg1:=dblArg1)